Unable to start CalabashHostStrategyProxy

If you are running Xamarin UI tests and receive the following error message:

SetUp : System.Exception : Unable to start CalabashHostStrategyProxy

You can fix the error by making sure that you do not run unit tests in the Xamarin IDE and for example Xamarin Test Recorder at the same time. There can be only one Calabash host instance the UI test runner can connect to and if it is already started by another instance, starting the second instance will fail. Wait for the first instance to finish testing and shut down before you start a new one.